Surface Failure and Fatigue Life investigation of Boron Steel

Bhat, Chandrashekhar and Anoop, A D and Gopinath, K and Jagannath, K and Sharma , S S and Prabhu, P R (2012) Surface Failure and Fatigue Life investigation of Boron Steel. International Journal of Research in Engineering and Technology, 1 (3). pp. 167-171. ISSN 2277 – 4378

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Abstract

Rolling contact fatigue (RCF) behavior of case carburized 20MnCr5B boron micro alloyed steel is carried out to judge its suitability for truck transmission gears. RCF tests were conducted in a nut cracker type test rig. The failure criterion is the formation of a single pit. Vibration based data acquisition system was established for specimen failure monitoring. Failure was identified by performing Fast Fourier Transform (FFT) analysis of the time domain acceleration signals from the accelerometer that indicates the failure of the specimen. RCF life testing was limited to a range of 2000 to 3000 MPa contact stress. S-N curve was plotted using contact stress levels and the corresponding RCF lives from experimental results. The equation for the S-N curve was obtained as σ N 0.0652 = 6941, where σ is the contact stress in MPa and N is the number of survival cycles.

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